Question 6 :
A null value is assigned when no other value applies.
Question 7 :
A synonym is two or more attributes that have different names but the same meaning.
Question 8 :
The primary key in a relation does not need to be underlined.
Question 9 :
In a 1:M relationship, the primary key on the one side migrates to the many side to become the foreign key on the many side.
Question 10 :
Normalization is a formal process for deciding which attributes should be grouped together in a relation.